linux-kernel - Re: [PATCH v9 0/4] zram/zsmalloc promotion

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Date:	Tue, 10 Dec 2013 18:18:20 -0800
From:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:	Minchan Kim <minchan@...nel.org>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org, linux-mm@...ck.org,
	Jens Axboe <axboe@...nel.dk>, Hugh Dickins <hughd@...gle.com>,
	Rik van Riel <riel@...hat.com>,
	Konrad Rzeszutek Wilk <konrad@...nok.org>,
	Luigi Semenzato <semenzato@...gle.com>,
	Seth Jennings <sjenning@...ux.vnet.ibm.com>,
	Nitin Gupta <ngupta@...are.org>, Bob Liu <bob.liu@...cle.com>,
	Pekka Enberg <penberg@...nel.org>, Mel Gorman <mgorman@...e.de>
Subject: Re: [PATCH v9 0/4] zram/zsmalloc promotion

On Wed, Dec 11, 2013 at 11:09:59AM +0900, Minchan Kim wrote:
> Hello Greg,
> 
> On Wed, Dec 11, 2013 at 11:04:35AM +0900, Minchan Kim wrote:
> > Zram is a simple pseudo block device which can keep data on
> > in-memory with compressed[1].
> > 
> > It have been used for many embedded system for several years
> > One of significant usecase is in-memory swap device.
> > Because NAND which is very popular on most embedded device
> > is weak for frequent write without good wear-level
> > and slow I/O hurts system's responsiblity so zram is really
> > good choice to use memory efficiently.
> > 
> > In previous trial, there was some argument[2] that zram has
> > similar goal with zswap so let's merge zram's functionality
> > into zswap via adding pseudo block device in zswap but I and
> > some people(At least, Hugh and Rik) believe it's not a good idea.
> > [2][3][4] and zswap might go writethrough model[5]. It makes
> > clear difference zram and zswap.
> > 
> > Zram itself is simple/well-designed/good abstraciton so it has
> > clear market(ex, Android, TV, ChromeOS, some Linux distro) which
> > is never niche. :)
> > 
> > Another zram-blk's usecase is following as.
> > The admin can use it as tmpfs so it could help small memory system.
> > The tmpfs is never good solution for swapless embedded system.
> > 
> > Patch 1 adds new Kconfig for zram to use page table method instead
> > of copy.
> > 
> > Patch 2 adds more comment for zsmalloc.
> > 
> > Patch 3 moves zsmalloc under mm.
> > 
> > Patch 4 moves zram from driver/staging to driver/blocks, finally.
> 
> Patch 1(suggested by Andrew Morton) and 2(Just comment to make review easy)
> are prepartion for promotion so I hope it could be merged into your staging
> regardless of allowing promotion at the moment.

Sure, I'll be glad to do so, thanks for letting me know.

greg k-h
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